# -*- coding: utf-8 -*-
import re

if __name__ == '__main__':
    aaa = ""
    bbb = None
    print(not aaa)
    print(not bbb)


    relay_pos = "1_3,4，5-7;8"
    res1 = re.split(',| |，|-| ', relay_pos)
    print(res1)
    res2 = re.split(r'[, ，_;-]', relay_pos)
    print(res2)

    aa = {"a" : 1, "b": 3}
    print(aa["a"])
    print(aa.get("c"))
